Knob



FIG. 1 is a front elevational view of a knob, embodying my design;

FIG. 2 is a rear elevational view thereof;

FIG. 3 is a left side elevational view thereof, the right side view being a mirror image of the side view shown;

FIG. 4 is a top plan view thereof;

FIG. 5 is a bottom plan view thereof;

FIG. 6 is a top, rear and left side perspective view thereof; and,

FIG. 7 is a bottom and right front perspective view thereof. 

The ornamental design for a knob, as shown. 